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Ldns.com

fast DNS lookups from the URL bar. Look up DNS records, RDAP/WHOIS, email authentication (SPF, DMARC, DKIM, BIMI), TLS certificates, security headers, ASN, and subdomains for any domain. Instant, free, no install. I built LDNS because I'm constantly curious about domain names - who owns them, which nameservers they use, how they're configured, and what their DNS records reveal.

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